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Figura 3.28: Diagramas para as rochas do Granodiotito Rio Maria: (a) Diagrama RI x R2<br />

(La Roche el al. 1980); (b) Diagrama discriminante de ambiente tectônico, (Y + Nb) x Rb<br />

(Pearce et al. 1984).<br />

Programa Geologia do Brasil – Folha Marajoara<br />

80

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